Arc-lamp.



CHRISTIAN HENEICHSEN, or rITTsEIELD, MASSACHUSETTS, AssIeNOE To GENERAL ELECTRIC COMPANY, -A CORPORATION OE NEW YORK.

Anc-LAMP.

Specification of Letters 4Patent.

Patented Sept.. 7, 19115.

Application filed October 11, 1912. Serial N o. 725,124.

and apparatus for correcting the magnetic v action upon the arc ofthe current which is conducted7 through the side rod past the arc. When an arc is formed between vertically alined electrodes, the are current is either conducted to the upper electrode when the upper electrode is the positive and when the current is direct current and through the arc to the lower electrode; or in case the lower ,electrode is the positive, the direction of the vcurrent is reversed. In either of these cases and Lalso when alternating c'rrentis used, it becomes necessary to conduct the arc current past the arc, and this current exercises a magnetic repelling effect upon the arc, driving the same to the sides of the electrodes remote from the conductor which carries the current, thereby causing the arcing faces of the electrodes to burn slanting, and this results in objectionable shadows and also causes the arc to rupture with too great frequency, and in general results in unsatisfactory Operation of the lamp. I overcome these difficulties by so"passing the current to and from the electrodes as to neutralize the blowing effect of the current in one conductor bv the current in other conductors, all suitably arranged with reference ,to each other and to the arc.

My invention has as a further object a novel arrangement of conductors for leading the current from the side rod to the lower electrode, whereby the blowing action which results from the current in the side rod toward the end of the life of the lower electrode is avoided.

While my invention is applicable to any arc lamp where the evil of side-burning of the arc exists, it is particularly useful in conjunction with iaming arcs, as such arcs are long and rather slender and are easily influenced by external conditions. Moreover, as practically all of the light is emitted from the arc itself instead of an incandes- ,r y j tion reference is lelectrically connected lamp cent tip, it is obvious that the shadowsl resulting from tapered electrodes are particularly rpronounced and objectionable.

For a fuller understanding of my invenhad to the accompanying drawings, in which- Figure 1 is a side elevation of a portion of an arc lamp embodying my invention, and

, Fig. 2 is a sectional plan View on the line 2-2 of Eig. 1.

In the drawings 1 and 2 are the upper and lower electrodes, respectively. The upper electrode passes through and is guided by an economizer 3 of usual form ,and also through the bottom The 'lower electrode 2 is Pcarried by a pair of arms 6, 7 which extend somewhat slantingly toward the electrode from the lower end of the side rod 5. These arms-6,7 extend partially around the lower electrode and are thereto through plates 8 and 9 Within which the lower electrode is clamped. Vith lamps such vas have hitherto been commonly used, the current in the side plate 4 of the lamp.

rod is conducted therefrom awav from the lamp and the current in this side rod blows the arc to that side of the electrodes remote from the side rod, thereby causing the arcing facesof the electrodes to become slanting and bringing about the unsatisfactory operation referred to above. Instead of conducting the current immediately away from the as it leaves the side rod, I lead the current downwardly through a flexible connection l0 to a conductor 11 arranged substantially parallel to the side rod 5 and adjacent thereto and preferably immediately behind the side rod 5, as I nd that this is the most satisfactory arrangement. From the lower end of this conductor, the current passes in two substantially equal branches through a ring 12 surrounding the arc and a conductor the arcing face of theflower electrode as to olf-set whatever resulting blow from the two conductors 5 and 11 may exist. In the con.

struction which I have here shown in which the plane of the ring 13 passes through the arc, the action of the current passing through the two branches of the ring is nelltral with reference to the'arc.

When inclosing globes more or less conical in form, such `as are commonly used with flame lamps of this character, are employed, the side rod at the lower end, or the arm which is secured to the bottom of the side rod, is necessarily inclined downwardly toward the electrode in order tov bring the point of support for the electrode sufliciently below the arc to accommodate an electrode of the required length and at the same time to cause the lower end of the side rod or the arm secured thereto to conform to the shape of the globe. Under these circumstances,

when the lower electrode is nearly consumed' and the inclined lower end of the side rod is brought opposite to the arc, the current in the inclined portion of the side rod is necessarily nearer the arc than is the current in the vertical portion of the side rod lunder normal conditions, with the consequence that the current exercises a stronger magnetic action on the arc than normally, and the arc is driven to the opposite sides of the electrodes. Ihave overcome this difficulty by conducting the current from the side rod to the lower electrode through two branches or arms which extend partially around the electrode, thereby obviating the repelling action, which would be caused by the current in a single conductor inclined downwardly toward the lower electrode.

While I have illustrated in the drawings what I consider to be the best embodiment of my invention, it is obvious that the same is susceptible of Various modifications without departing from the spirit thereof.

What I claim as new and desire to secure( Letters Patent of theUnited States, is 1. In an arc lamp, a pair of axially alined electrodes between which the arc is formed, a conductor adapted to carry the arc current past the arc, a second conductor arranged parallel and adjacent to said first conductor and connected in series therewith, and a con- Iductor arranged substantially parallel to said first conductor on the opposite side of the arc therefrom and electrically connected to,said second conductor.

2. In an arc lamp, a pair ofaxially alined electrodes between which the arc is formed, a conductor adapted to carry the arc current past the arc, a second conductor arranged substantially parallel and adjacent to said first conductor and connected in series therewith, a third conductor substantially parallel to r the opposite 'side of the arc therefrom, and a conducting ring inclosing the axis of the electrodes connected to the second and the third conductors. 3. In an arc lamp, a pair of axially alined electrodes between which the arc is formed,

a conductor adapted to carry the arc current past the arc, a vsecond conductor arranged substantially parallel and adjacent to said first conductor and connected in seriestherewith, a third conductor substantially parallel to said first conductor on the opposite side of the arc therefrom, and a conducting ring Vsurrounding the arc electrically connected to the second and the third conductors.

4. In an arc lamp, a pair of axially alined electrodes between which the arc is formed, a conductor adapted to carry the arc current past the arc and two arms electrically connected to said rst conductor and to the lower electrode and inclined downwardly from the bottom of said conductor andl passing partially around said electrode.

5. In an electric arc lamp, a pair. of electrodes, one of which has its arcing face above that of the other,

side thereof, a second conductor adjacent to said first conductor and connected in se- CHRISTIAN HENRICHSEN.

Witnesses:

A. K. UNGENT,

C. S. MEIG.

a conductor adapted to carry the arc current past the arc on one 

